Hello Michael,
Did you executed "SetCode84.exe" in the Win-Digipet-Folder once after the installation of the update 8.4?
If this does not work, then I think the copy protection in version 8.4 could have a problem with an AMD-64-bit-processor, but until now there is no special version for the AMD-64-bit processors. Maybe the german version 8.5.1 is able to work on such a machine (if your version 8.4 does not), but unfortunately this version 8.5.1 is only avaibale in German. There was no time to release an international version 8.5.1, because of the ongoing work for version 9.0.
I will ask some German users if they have any experience with such a processor.
For a backup you have to copy the following files from you Win-Digipet-Main-Folder (to a CD for example) and for a restore also back to the Win-Digipet-Main-Folder (not the Backup-Folder):
-WDRoutes.mdb
-WDigilok.mdb
-all file with the ending "dat"
-all file with the ending "akk"
-all file with the ending "tb"
-all file with the ending "fpl"
Remember:
Depending on your operation system it´s maybe necessary to remove the write-protection from the files after a restore from a CD.
Best wishes
Markus